ChannelDefinition Represents a channel definition in a PQDIF file. The channel definition resides within a and defines a .

 ChannelInstance Represents a channel instance in a PQDIF file. A channel instance resides in an , and is defined by a inside the observation record's .

 ContainerRecord Represents the container record in a PQDIF file. There can be only one container record in a PQDIF file, and it is the first physical .

 DataSourceRecord Represents a data source record in a PQDIF file. The data source record contains information about the source of the data in an .

 LogicalParser Represents a parser which parses the logical structure of a PQDIF file.

 MonitorSettingsRecord Represents a monitor settings record in a PQDIF file.

 ObservationRecord Represents an observation record in a PQDIF file.

 SeriesDefinition Definition of a .

 SeriesInstance Represents an instance of a series in a PQDIF file. A series instance resides in a and is defined by a .

 Phase Phase types.

 QuantityMeasured Physical quantity under measurement.

 QuantityUnits Units of data defined in a PQDIF file.

 StorageMethods Defines flags that determine the how the data is stored in a series instance.

 Equipment Power quality equipment and software.

 QuantityCharacteristic Specifies additional detail about the meaning of the series data.

 QuantityType The high-level description of the type of quantity which is being captured by a channel.

 SeriesValueType Defines tags used to identify different series value types.

 Vendor Vendors for power quality hardware.